player_control: remove unused function playerCurrentDecodeSong().

src/player_control.c

@@ -268,10 +268,3 @@ double getPlayerTotalPlayTime(void)
 {
 	return pc.total_play_time;
 }
-
-/* this actually creates a dupe of the current metadata */
-struct song *
-playerCurrentDecodeSong(void)
-{
-	return NULL;
-}

src/player_control.h

@@ -149,9 +149,6 @@ player_get_audio_format(void)
 	return &pc.audio_format;
 }
 
-struct song *
-playerCurrentDecodeSong(void);
-
 void playerInit(void);
 
 #endif